some gotchas and issues

continuous shooting mode results in only 12bit files with reduced dynamic range but still in a large 14 bit file

dynamic range at base ISO 100 is not as good as the Sony a7R II full frame mirrorless camera, and it is not iso-invariant, meaning that when shooting in low light you do need to bump up the ISO rather than shoot at ISO then increase shadows in post 1)

to realise the 20fps AF-C capability you will need to shoot with dedicated lenses designed and optimised for the Sony

the longest focal length Sony E mount lens capable of 20fps AF-C is the new Sony 100-400mm f/4.6-5.6 and when coupled with the 1.4x converter you get 560mm f/8 so no real advantage over the Olympus OM-D E-M1 II with 300mm f/4 which gets you to 600mm f/4 at 2EV better ISO and with 6.5EV IS at 18fps with AF-C, although you do get to zoom but then it is likely the zoom plus TC will result in less sharp images than the Olympus 300mm prime which is amazingly sharp.

if you want to shoot flash, you must use mechanical shutter and thus restricted to only 5fps burst - half what you can achieve with the Olympus OM-D E-M1 II with flash and still have AF-C, but if you don't need AF-C, the Olympus will shoot mechanical shutter at 15fps

the electronic shutter speed of 1/32,000th second is only available in S or M exposure modes

IS unlikely to be as effective as in the Olympus OM-D E-M1 II

no 60fps burst mode as with the Olympus OM-D E-M1 II

no Pro-Capture mode as with the Olympus OM-D E-M1 II

apparently touch AF does not trigger shutter automatically as can be configured on the Olympus OM-D E-M1 II

Eye AF cannot be configured to select closest eye as on the Olympus OM-D E-M1 II

Eye AF cannot be configured to target the subject you want when there are multiple faces

no in-camera user configurable focus limiter range to ensure out of range areas are ignored as on the Olympus OM-D E-M1 II

no long exposure timed modes as on the Olympus OM-D E-M1 II such as Live Composite

weathersealing unlikely to be as good as the Olympus OM-D E-M1 II - you may want to add some protection in a downpour, and don't pour water on it to clean it!

you will struggle to get this into a jacket pocket

no support for XQD cards such as on the Nikon D500 and D5

video issues:

at 4K 30p the image area is cropped (no crop at 4K 24/25p, nor at 1080HD 120p)

“Along with the option to use the main shutter button to start and stop clips in video mode, the screen backlight does not dim when you record 4K, like it does on all the existing Sony bodies. You can see your recording outdoors and there’s no gamma shift.”

much better than a Nikon D4s sports dSLR and has significant advantages over a Nikon D5 pro dSLR but ergonomics is still an issue and when shooting flash you are forced to use its horrible noisy mechanical shutter

“What a camera. So, so good. This is everything a wedding photographer has been dreaming of. I can’t go back and shoot with an SLR now. Silent shooting, the best focus system, eye-AF, 32000th/s, in-camera stabilization, fantastic EVF, 20fps if needed, smaller and a lighter than a D4s (similar to D750), two SD slots. ”